LED lighting has become a mainstream technology. LED flashlights, traffic lights and lamps are everywhere. Countries are promoting the replacement of incandescent and fluorescent lamps in residential, commercial and industrial applications powered by main power with LED lamps. However, if LED lighting is to replace incandescent lamps and become the main body of the lighting field, silicon controlled dimming LED technology will be an important factor.
Dimming is a very important technology for light source. Because it can not only provide a comfortable lighting environment, but also achieve energy conservation and emission reduction. With the rapid growth of LED application market, the application scope of LED products will also continue to grow. LED products must meet the needs of different application environments, so LED brightness control function is also very necessary.
Although the LED lamps without dimming still have its market. But the application of LED dimming technology can not only improve contrast, but also reduce power consumption. Therefore, the development of LED dimming technology is an inevitable trend. If LED wants to realize dimming, its power supply must be able to output variable phase angle of silicon controlled controller, so as to adjust the constant current flowing to LED in one direction. It is very difficult to do this while maintaining the normal operation of the dimmer, which often leads to poor performance. Blinking and uneven lighting occur.
Facing the problems of LED dimming, major enterprises in the industry have gradually studied high-quality LED dimming technologies and solutions. Marvell, as a world leading semiconductor manufacturer, launched its solution for LED dimming. This scheme is based on 88EM8183 and is designed for offline dimmable LED lighting applications, which can achieve a minimum of 1% deep dimming. Because the 88EM8183 uses a unique primary current control mechanism, it can achieve extremely strict output current rectification in a wide AC input range.
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